For April Fools' Day, Mojang has launched the hoax website Mars Effect. "After playing around with names like "Elight", "Wind Commander", and "Steve Online", we finally settled on the very catchy name "Mars Effect," Notch notes. There's no teaser trailer yet, but it has a feature set that sounds reasonable until you get about midway down to "abandoned ships full of loot" followed by "waist-high walls."